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The best SF
The Moon is a Harsh Mistress (New English Library science fiction)The Moon is a Harsh Mistress (New English Library science fiction) by Robert A. Heinlein
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Early Heinlein is best - and this is revolution run by a computer
CyteenCyteen by C.J. Cherryh
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How widespread cloning would change things
Chasm City (Gollancz S.F.)Chasm City (Gollancz S.F.) by Alastair Reynolds
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A convincing future of epic proportions
The Fresco (Gollancz S.F.)The Fresco (Gollancz S.F.) by Sheri S. Tepper
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Helping the aliens who've helped us - Tepper at her best